Tropes:
- Big "WHY?!": NEPTR after Football smashes his door window.
- Bottle Episode: Takes place entirely in the fort with only Finn, Jake, NEPTR, BMO and Football.
- Dunce Cap: The traffic cone BMO/Football is forced to wear after smashing the mirror serves this purpose.
- The Man in the Mirror Talks Back: BMO threatens Football from the reflections.
- Maybe Magic, Maybe Mundane: It's not clear if Football is actually real or BMO is a bit crazy; there is evidence to suggest either way.
- Noodle Implements: The treehouse is filled to the brim with grapefruits for unexplained reasons.
- Portal Network: BMO is able to follow Football around through various reflective surfaces in the treehouse.
- Portal Pool: BMO and Football finally switch back when Football falls into the pond in front of Finn and Jake's home. Football likes it better than the bathroom mirror.
- Rage Against the Reflection: When BMO goes after her, Football starts smashing all the reflective surfaces in the house. Including NEPTR's body.
- Split Personality: Implied, but not explicit; it's equally likely Football was Real After All.
- Toilet Humor: When Finn finds Football smashing the bathroom mirror:Finn: Hey, Jake, BMO went all hog-wild in the bathroom.Jake: Groooss!Finn: Not like that.Jake: Oh.
- Unusual Euphemism: BMO threatens Football with being "put in the dirt hole".
- Unusually Uninteresting Sight: Finn and Jake mostly take BMO/Football's antics in stride. It's implied that BMO does things like this all the time and they're just humoring him.
